package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    //查询商铺类型
    @Override
    public Result queryTypeList() {

        //        List<ShopType> typeList = typeService
//                .query().orderByAsc("sort").list();
        //存在，返回数据
//        List<ShopType> shopTypes = JSONUtil.toList(shopTypeJson, ShopType.class);
//        return Result.ok(shopTypes);

        //查询Redis缓存中是否含有
        String key="cache:shop-type:";
        String shopTypeJson = stringRedisTemplate.opsForValue().get(key);

        if(StrUtil.isNotBlank(shopTypeJson))
        {
            //Redis中含有商铺缓存信息，转为集合并返回
            List<ShopType> shopTypes = JSONUtil.toList(shopTypeJson, ShopType.class);

            return Result.ok(shopTypes);

        }

        //Redis缓存中不存在，查询数据库
        List<ShopType> shopTypeList = query().orderByAsc("sort").list();


        if(shopTypeList.isEmpty()||shopTypeList.size()==0)
        {
            //数据库中不存在
            return  Result.fail("不存在改分类！");
        }

        //数据库中存在则存入Redis中
        String toJsonStr = JSONUtil.toJsonStr(shopTypeList);

        stringRedisTemplate.opsForValue().set(key,toJsonStr);

        return Result.ok(shopTypeList);
    }
}
